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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a4815d16eb127541b484a8d0137c44328e1b71c1d610ff1c84d14294d4b503' 
  AND token = '+noqJLMNm80t7pZ8qTQzzbhnXS8ceKm1KsKrotyWmlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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