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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a7a5398246441fac1e848b56684534d182fb7d5e4c66ac7b8d0920f49e3341' 
  AND token = 'rodxejzx4eD7/cTjpFa62jv0ZPOtOoNsDj0Ieveae2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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