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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bbad64c1294e8940f5ec514ec62c34ed0879a84f6d48580296e24271ada6c04' 
  AND token = 'sdW30kSCtGRDrtexEmUQttvigu32JOmAJL0WU+vVHGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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