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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb9db305ddfcf7c01dfb1e26c932710fd0b5912a767df7814c67e350de6c5df' 
  AND token = 'aCxjS366l58v2dqyKDsNsl1398pYegzEwoZPOo6nyhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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