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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9aceb743f4fa93b2ba104d6fbfa7821353b1411ea94a3fa5da60319a28383da' 
  AND token = 'q3KUEyedcLPto4S+lFrjYI/cpo/+wy9r7HuoKr84fBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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