SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d70131f2f9cf64f873e27ce190452486fedd9a5bd74b71e9ca0dc2558b46e0e' 
  AND token = 'g6bjqZdxlVGOJaFS1Eq+RvTyJYzS3or7uKIfmtlXcso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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