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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3604dab278c03b41a9b5124ad4698ee98da0c37f876a332491bc4d670c75ee8e' 
  AND token = 'dP2+rBq/puxbpN1u192CCkmJ20SGBMFtk/WOWZDmgGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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