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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab708fdc34296725426b0624ffb60e91fa890d92a80b5fa1f77214d7ce9b278' 
  AND token = 'ydlsqV15ywjnExTP2ov8v/TY4DiQQgE7BbOdR1PMv4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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