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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f74d2493039abbb99aa287fc0535333e1cfddea47e70997b0fd08c64ee7631f' 
  AND token = 'Cty3zxmZCKUYM8N6YkjMQ1IPC1qWfP3VHqLX7KKdAvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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