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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74f5e96c45af659aa415f5889c5eae2be7171fe5050c77be96d0d538e8d8fb5' 
  AND token = 'cWoKu457hMNwqYEUmdK8ayP4tov1GCidb93Kt7NVqLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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