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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc883c2ecf5a153aa2c0bda8e9cb3034a439bd11363ec738ff0b07eb08539830' 
  AND token = 'H9vfY8s5vvdjv0vzvqrLo48nodSExzJ2Oo2KlEs3WaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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