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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590764fe74cd80f2bbe685f2fa96022c0294e2903c078c372a85a84ffdbd4924' 
  AND token = 'hx6JwEurQupNsak++pHDucGqBVDSd+xcr8fd5G8ksmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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