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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd0e958ba40c2c31c13028ab5ddfdadc7e4e2b7133c1b30446ccd6a66e9d5f3' 
  AND token = 'BW0zesbtAoZQRxOzjT2p3MoSSbd5HBk8QBqFlv1q94Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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