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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5639abbf98acb246df88f2c343946e85682ea1a41f04b66839605c27e7c556' 
  AND token = '5VaucCexcAllkzYOWFo1unt5E6v+OzcgeEIXq8YBL50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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