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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468817c516b0eee3019a92ba6b8ad9acf2a41c139dfa5981a3ba9b4a96256384' 
  AND token = 'EWBqxPkZ5MUuy0J+A0Dhn6vTfYKqOmlaX4d6WtnIfAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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