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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004229cea910b14ea6da5abcb7cc4c2b41ca6a26d1660b2851011c573c74b138' 
  AND token = '8hekdyEuShHB2QGfTtCNPhiw8JSXufQx4w3N7iIqknU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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