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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f2eb52782f4b427b033b25e62ff8797daf5e8b7aec25f9f2436be40c91b5aa' 
  AND token = 'RvbZeH2POz4tGckUB5rrsRQB0Hbyz5Ipokj1zaX4s34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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