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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faae7d8c2fa65f357c61f80e2ac66ae1cf6b0ea6bd655411dd038d0659e3c30a' 
  AND token = 'oY6lQZpMto8S8l90yMVMKcVZEAcHU0VehX+1kRgomjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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