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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6085d1196b3316fb9dea5c13c274909c391feeb00ea92b948a1dc10e22413a78' 
  AND token = 'cT8PU1e+iniVVBObCt2MzzA9N+88kHmZ/+LSZt01YOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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