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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a818e176833e4ba3952d89e71e20879ef75bf551c8fe230ba2b1d0d69c45b30' 
  AND token = 'A6GJmcw2kgQU+wXzl3epFAd2s7gUvhiFtaGsxRZOg9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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