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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a5f40c61924aade5d22a399af41f7aa60a77cc933081dce7f419e87851d3da' 
  AND token = 'POTJXvdlJUqSD6j5JPV4x2A3wX1NO5RtGoJUuPwlNRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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