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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e0b4c5ddbebeadb9d79a2e60ecdf930647927c680e1bb045a058c9823161d2' 
  AND token = '9a/GrUNxdqKJv65UokeNBad9BX05mTRmJyBTLXFEazA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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