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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bca3bf14ddf41c0da66a2d8e27c0b7ce90c86b6d59faaa2ea3080dd0b26ed5' 
  AND token = 'vj1t2ZsdPBxFzokPBeeYMYCjWEX1hNZeijbibXIXoCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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