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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8e73bca8be4f540d2a44ae767758fdd4fc2a855c4240ccc6875f194818f487' 
  AND token = 'DeZQCJDAMG3DV23RYZIlIKwaW4ngIuVyc0oNB0g8pSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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