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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f797418db177f8c08154d6fbc07af005e9f7222449c2cd4d5843eb6e6dbb2b' 
  AND token = 'xNBaNLDjJ2sHbkWy0lviiK2HQ1MZ4WSs0HSPWUKZraA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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