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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc8d9a3b807f2889d27b2ab71f8cd72016a7dc987870c9cce2196d3daf2d657' 
  AND token = 'GvTheUptSHr5JX5RC0cgHNVx5/sZtEUSu007fV7HDxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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