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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237ea31961b0c8a0038bc3b7cce6898f7ac14654b8f48bd4f02ee0389f133186' 
  AND token = '/vJvofqk0kMmutiUSfRbVjKzelWs7oCvyhdZFbH85lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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