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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa4d50e27a5c29fd876ceb3664f8f4128ebe043fef33df82e96a25bc45b33bf' 
  AND token = '2euxr8qZfVZaCcwRLkn0NtVAjkZ+nSBWmFhEIrX79+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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