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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e71793daf09ba93467507a4956c79c982044aa44f05a70810e56a2a4f2cb3c' 
  AND token = 'Seo6CqLK3oPOLZ7Kq8B2UNgUx37Ft0WdEhQ/Hcmc95Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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