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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1adaa12f6c590922170d6c050ee22109d20ed945668ff035f763e855d42798e1' 
  AND token = 'G3JbQ4FJ8xbAJjHthB/BYmB5ByLHDYOOlLJ7W04zNfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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