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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '543630cc9461f313c407d79c0ab1904b19de70f8da5debcf676c5da1ab23800f' 
  AND token = 'nVmRqNJKJ1VEcYGX6hnirTRHD42ST1YM/ZamklcDDWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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