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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc4b79c67f85683748d844ad7669135bf65951d97591ea09b142cca556908d3' 
  AND token = 'ns0ooZ8pNKFyGSXX3AKm+yeMML3CJRz5LK9ISQhJ5os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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