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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5caff316e9e337ab5b4e9c1fe6dd9a0e56f34a29181f5eb5ed373e251b40e4' 
  AND token = 'yRjQCjUz0U1LXYssdLVXOjOxqHk4k9JwtdWNK3gTWtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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