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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396eae3807e46baf31deb81f24771db2a71d7068b7d0a61a88c13514cacabd6e' 
  AND token = 'we3Dn+zRa4lH0j70tBzyHP53xMjb6U94NEmrDrzGdiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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