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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e3efd016f564eef8ceea3e12761dc88c5523e8c02105b99dc7c090e8302d75' 
  AND token = 'RtKd/aE5hZlnbXAq4uqF8o9nOLtmM/jvMW7L+KH/qsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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