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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789bb16307ae422e12f01f27b5be0155eba3c5354fadb337c0f56ded3b5942ae' 
  AND token = 'NLo5z35gseAuWyaw3rpQlsX5GEEjLZN7ZGL+Y5Vwzk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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