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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51f1f7f657f6d1cf85f7d4ca2d92a7b3e529eb197ad0b6ef7532af6a7709773' 
  AND token = 'a+AbZTGhFBYKKRl1nTeIxAW5tLBOIP5GLdvCZHJ69Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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