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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab922a4abe86ab32ef6ce7a8e3f2a3120cbf384fd57e8cb06d8d3006555ede8' 
  AND token = '026oAFqflUoG3YXSCKpKE/Ez1f2iCp7zeWKVVLoukss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}