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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c551da6d79a9ef647d38b0e820a4af6a66f6aefd47814286b3d2824472f1e2' 
  AND token = 'IW+dUbC/7O/LvyIe+NJxgvBPGS63qBkESD5M4ehiFlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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