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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c1abe5fa97135c48b8ad22f0e06aad40dc61e6003552bc51eea5091fd9d0d8' 
  AND token = 'CS2+AgnS0etHhZ7y04sN8CttzA6+dF+qIntsawSVCeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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