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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f40f772673525fde1cf3b34cf62f0c0b1d3e85ada33145a98961e579c34a6e' 
  AND token = '31b7mCeqoi+HO3IVsY9SuZEA1MGo0OY+ube49X4A0/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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