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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b88e12abf6b6d221a28eb0998c9b892c3dfb821234e91ebdc6ebb77acc1578e' 
  AND token = 'kD0Jk5qtCJ0wZlvMqvwu3fUlu9RlkG63QRiXqS3DF3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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