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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dfbfe171622e0a27e3dc53c3d556d872f3d48d63d69e025d1acdbc16a754c7a' 
  AND token = 'd7l+zCGQMd9ehIeGKZCN305c36iKBfNxGcbqQVDNaNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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