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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f80430f9b2965bab821608c91c5f97311435b96cc08956d0fc31f59bb5824a6' 
  AND token = 'G+u9hZrg/Y62L8f8bxej/r9j8+AF+YiuCz8De1R0rD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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